FIND THE SMALLEST ANGLE IN THE TRIANGLE! PLEASE HELP

From the side/angle inequality, we see that the smallest angle of a triangle must be opposite its shortest side. In this case, that angle is opposite the shortest side so our answer is

As for finding its measure (which I'm aware the question probably didn't ask for), we can use the law of cosines:

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.